Hi Sam
the "OctaneExportMeshes" work from commend bar but there is always the problem of duplicate materials so I finally resolved with the release of Rhino V5 WIP.
No problems with the exporter and no problems with duplicate materials.
Thank you again for your help.

Francesco

Thanks for your reply Sam.
Your solution has been successful, but when start Octane gives me the following error:
There was an error parsing the command-line arguments:

Couldn't read argument value from string '2,94827251' Argument: (--cam-pos-x)

USAGE:

octane [-t <node name>] [-m <string ...

Hi Sam,
a great thanks for all the work you do.
Using Rhino v4 SR9 and when I try to send a rendering, displays the following error message.
Thanks in advance for any suggestions.
Good work!

Francesco